libudev: import hwdb and export lookup interface

[elogind.git] / src / libudev / libudev-hwdb-def.h

diff --git a/src/libudev/libudev-hwdb-def.h b/src/libudev/libudev-hwdb-def.h
new file mode 100644 (file)
index 0000000..8bc6944
--- /dev/null
+++ b/src/libudev/libudev-hwdb-def.h
@@ -0,0 +1,74 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2012 Kay Sievers <kay.sievers@vrfy.org>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifndef _LIBUDEV_HWDB_DEF_H_
+#define _LIBUDEV_HWDB_DEF_H_
+
+#include "sparse-endian.h"
+
+#define HWDB_SIG { 'K', 'S', 'L', 'P', 'H', 'H', 'R', 'H' }
+
+/* on-disk trie objects */
+_packed_ struct trie_header_f {
+        uint8_t signature[8];
+
+        /* version of tool which created the file */
+        le64_t tool_version;
+        le64_t file_size;
+
+        /* size of structures to allow them to grow */
+        le64_t header_size;
+        le64_t node_size;
+        le64_t child_entry_size;
+        le64_t value_entry_size;
+
+        /* offset of the root trie node */
+        le64_t nodes_root_off;
+
+        /* size of the nodes and string section */
+        le64_t nodes_len;
+        le64_t strings_len;
+};
+
+_packed_ struct trie_node_f {
+        /* prefix of lookup string, shared by all children  */
+        le64_t prefix_off;
+        /* size of children entry array appended to the node */
+        uint8_t children_count;
+        uint8_t padding[7];
+        /* size of value entry array appended to the node */
+        le64_t values_count;
+};
+
+/* array of child entries, follows directly the node record */
+_packed_ struct trie_child_entry_f {
+        /* index of the child node */
+        uint8_t c;
+        uint8_t padding[7];
+        /* offset of the child node */
+        le64_t child_off;
+};
+
+/* array of value entries, follows directly the node record/child array */
+_packed_ struct trie_value_entry_f {
+        le64_t key_off;
+        le64_t value_off;
+};
+
+#endif